Group puzzles have always been one of the most popular events in terms of puzzler participation. Unfortunately, they don't pop up too often because they often take tens of hours, sometimes even hundreds of hours, to prepare in addition to the costs of buying games to giveaway. My last group puzzle, for example took over 100 hours of preparation and included 42 different giveaways. Jexel, the proprietor of itstoohard, was the original founder of the group puzzle. I remember back in June last year spending hours looking up answers to trivia questions and collaborating in sgchat to solve the various puzzles scattered throughout.

Of course, there are always various strategies a puzzler can employ. One is to use the work of others, then solve the final step yourself without sharing the answer. In late June, nitsogap created a much shorter group puzzle, but with enough complexity that only a single person managed to crack the code and enter the giveaway at the end.

Sadlerd was next up in late July or early August, with a group puzzle that was solved within a day. Then in early September, I released my first group puzzle with 10 stages and 15 prizes. Although not strictly a group puzzle, and one I mentioned before already, Hanneman213's porn puzzle had an interesting dynamic where you could share a single answer to the quiz. I believe Dys also made a mind reading quiz with shared answers at some point.

The last one that I can remember came from Zelghadis. This was another one in which the solution was not shared.

At any rate, feel free to do what you want. I would advise you to work as much as you can with each other, though, because you certainly won't be solving this alone.

Group Puzzle will be posted sometime later this week. I still need to put the finishing touches on
The A Puzzle a Day event will be suspended until the giveaways for the group puzzle ends on August 10 at 11:55 PM PST
Please fill in this poll even if you don't plan to participate. Instead of posting in the group puzzle giveaways, filling in this form counts as solving the group puzzle.

Puzzle has been posted

Teaser (There's no giveaway behind this):
It's dangerous to go alone! Take this!

Rules:
TBD

If you solve at least half (15) of the puzzles, you will get an invite to a private giveaway when the A Puzzle a Day series concludes. I'll try to pick something that no one has already, but no guarantees. Please make a parent post in the giveaway to be counted. Also, to be invited to the bonus giveaway, post in A Puzzle a Day #30 with the puzzles you have solved. You are not required to solve the puzzles before the giveaways end. Solving them at any point in time will count towards the 15 required puzzles.

Solutions:

Ha! The positive aspect of group puzzles is that I don't have to write the solutions! Everything, thanks to zelghadis and his group has been written up in a google doc. Thanks everyone for participating.

Just for reference, the list of all giveaways are as follows (forgive me from not making clickies, because frankly I'm too lazy)

List of Giveaways  
1. http://www.steamgifts.com/giveaway/ttxLy/the-darkness-ii  
    http://www.itstoohard.com/puzzle/bht21eq6  
    lever to get to level 2  
    http://www.itstoohard.com/puzzle/LICEl2f9  
    Old Lever code: x7sugQGp  
    Updated: wXfa7PQ7  

2. http://www.steamgifts.com/giveaway/52I6Y/spec-ops-the-line  
    lever to get to level 3  
    http://www.itstoohard.com/puzzle/TuIiV1Ha  
    Old Lever code: 42frXUB8  
    Updated: wnFxxTQ7  

3. http://www.steamgifts.com/giveaway/qeBem/binary-domain  
    lever to get to basement  
    http://www.itstoohard.com/puzzle/lpTYgYou  
    Old Lever code: WU8FhcTM  
    Updated: rXIMKbY7  

4. http://www.steamgifts.com/giveaway/bF5Ci/viking-battle-for-asgard  
Basement walls reveal the giveaway code  

The following 8 are for keys to get into the treasure room  
5. http://www.steamgifts.com/giveaway/reQFY/condemned-criminal-origins  
6. http://www.steamgifts.com/giveaway/AvMXl/hell-yeah-wrath-of-the-dead-rabbit  
7. http://www.steamgifts.com/giveaway/OJpj2/the-testament-of-sherlock-holmes  
8. http://www.steamgifts.com/giveaway/XJR61/sonic-generations  
9. http://www.steamgifts.com/giveaway/MzkAj/sonic-3-and-knuckles  
10. http://www.steamgifts.com/giveaway/FnL30/deadlight  
11. http://www.steamgifts.com/giveaway/tQNWd/insanely-twisted-shadow-planet  
12. http://www.steamgifts.com/giveaway/p6aYi/iron-brigade  

13. http://www.steamgifts.com/giveaway/vbaKL/mark-of-the-ninja  
Hidden in the teeth of the keys  
    http://www.itstoohard.com/puzzle/dmDh6t35  

14. http://www.steamgifts.com/giveaway/0uGh5/toy-soldiers  
Third Floor walls reveal the giveaway code  

15. http://www.steamgifts.com/giveaway/yUIUM/nexuiz  
Given when you revisit the entrance.  
    http://www.itstoohard.com/puzzle/OQrygNEW  

16. http://www.steamgifts.com/giveaway/Y1ma1/titan-quest-gold  
Hidden in stone wall + Mask  
One of the wall images will have bricks that somehow give a giveaway code  
http://i.imgur.com/6mJmkNe.jpg  
http://i.imgur.com/8Ho6HJZ.png  

17. http://www.steamgifts.com/giveaway/3s4Mi/duke-nukem-forever  
http://www.itstoohard.com/puzzle/2FkhPOWe  
Secret Giveaway #1.  
Hidden as the 8 character title of this quiz:  
http://www.itstoohard.com/puzzle/XxxLPlbo  

18. http://www.steamgifts.com/giveaway/IiSjS/warhammer-40000-dawn-of-war-dark-crusade  
    Overlay the rooms with half-life banners on each floor to get this code  

19. http://www.steamgifts.com/giveaway/r0gHd/warhammer-40000-dawn-of-war-ii-chaos-rising  
    Beating the Troll gives you this.  

20. http://www.steamgifts.com/giveaway/vX72i/warhammer-40000-dawn-of-war-ii  
    Description of wooden chest located in this quiz  
    http://www.itstoohard.com/puzzle/4Ybmkpd7  

21. http://www.steamgifts.com/giveaway/wmgpp/warhammer-40000-dawn-of-war-ii-retribution  
Located on the floor here:  
http://www.itstoohard.com/puzzle/SKYBpEjZ  

22. http://www.steamgifts.com/giveaway/QYW5b/rogue-warrior  
Description of Goblin during that fight has this  

Below are in Treasure Vault  
23. http://www.steamgifts.com/giveaway/AVLYE/torchlight-ii  
24. http://www.steamgifts.com/giveaway/VjJM6/bloody-good-time  
25. http://www.steamgifts.com/giveaway/5GjCE/duke-nukem-forever-hail-to-the-icons-parody-pack  
26. http://www.steamgifts.com/giveaway/HXGWk/duke-nukem-forever-the-doctor-who-cloned-me  
27. http://www.steamgifts.com/giveaway/uZEwD/deus-ex-human-revolution-the-missing-link  
28. http://www.steamgifts.com/giveaway/1U4nc/serious-sam-hd-the-second-encounter-legend-of-the-beast-dlc  
29. http://www.steamgifts.com/giveaway/Kyskr/victoria-ii-a-house-divided  
30. http://www.steamgifts.com/giveaway/n7Kze/prototype-2-radnet-access-pack  
31. http://www.steamgifts.com/giveaway/YlVs6/dawn-of-war-2-retribution-last-stand-complete-wargear-pack  
32. http://www.steamgifts.com/giveaway/gF40a/dawn-of-war-ii-retribution-complete-chapter-pack-bundle  
33. http://www.steamgifts.com/giveaway/TLEYP/dawn-of-war-ii-retribution-tau-commander-and-all-wargear-bunDle  

34. http://www.steamgifts.com/giveaway/rdSFn/tomb-raider-i  
Find with wand  
http://www.itstoohard.com/puzzle/t7Rnw0Qh  

35. http://www.steamgifts.com/giveaway/TSN5q/tomb-raider-ii  
In the basement  
http://www.itstoohard.com/puzzle/da4Obn0e  

36. http://www.steamgifts.com/giveaway/l3BHa/tomb-raider-iii  
In the basement  
http://www.itstoohard.com/puzzle/PusXGowO  

37. http://www.steamgifts.com/giveaway/GEUnm/tomb-raider-iv-the-last-revelation  
3rd Floor here:  
http://www.itstoohard.com/puzzle/wIX3nodn  

38. http://www.steamgifts.com/giveaway/ApYr3/tomb-raider-v-chronicles  
On the 3rd floor here:  
http://www.itstoohard.com/puzzle/GWPtFMZe  

39. http://www.steamgifts.com/giveaway/8gc49/tomb-raider-vi-the-angel-of-darkness  
http://i.imgur.com/p9WiVuG.png  
http://www.itstoohard.com/puzzle/XwCahbLJ  
Find the correct blocks  

Next 4 are in Treasure Vault  
40. http://www.steamgifts.com/giveaway/eHvHL/tomb-raider-anniversary  
41. http://www.steamgifts.com/giveaway/GwUHn/tomb-raider-legend  
42. http://www.steamgifts.com/giveaway/KwOV8/tomb-raider-underworld  
43. http://www.steamgifts.com/giveaway/y1jG5/x3-terran-conflict  

44. http://www.steamgifts.com/giveaway/co1gD/cubemen-2  
In the basement  
http://www.itstoohard.com/puzzle/yU0KH2NC  

45. http://www.steamgifts.com/giveaway/YMLbq/sid-meiers-civilization-v  
On the 3rd floor:  
http://www.itstoohard.com/puzzle/35Mr9Dx4  

In Treasure Vault  
46. http://www.steamgifts.com/giveaway/WsSu1/sid-meiers-civilization-v-gods-and-kings  

47. http://www.steamgifts.com/giveaway/KWVbR/euro-truck-simulator-2  
Hidden in sand  
http://i.imgur.com/u2a9WDh.jpg  
http://www.itstoohard.com/puzzle/N3KhFe88  

In Treasure Vault  
48. http://www.steamgifts.com/giveaway/gKPT6/strike-suit-zero